Cooling apparatus



E. F. STALCUP ET AL sept. 14, 1937.

COOLING APPARATUS 2 Sheets-Sheet l Filed OG'L. 1l. 1953 Fic., '1.

Il" Am com zn nu wAsHzn :MIMI

* as gq l l l l l l I l l n INVENToRs ERNEST F. STALcuP MILLHRD HJYELsoNl l l Pststsd Sept. i4, 1937 l 2,093,216

UNITED STATES; PATENT OFFICE COOLING APPARATUS Ernest F. Stalcup,Rutledge, and Millard A.

Nelson, -Prospect Park, Pa., assignors to Westinghouse Electric &Manufacturing Company, East Pittsburgh, Pa., a corporation of Penn-Sylvania Application October 11, 1933, Serial No. 693,194

17 Claims. (Cl. (i2-152) Our invention relates to refrigeratingapparaessary to reduce the temperature to 40 degrees F. tus. moreparticularly t apparatus 0f the type Cooling to 40 degrees F. can beaccomplished at known as steam jet refrigerating apparatus, andsubstantially higher efficiency than cooling to it has for an object toprovide improved appa- 37% degrees F., with the same total amount ofratus of this type which is adapted for operaheat removed in each case.A 5

tion at partialload. The apparatus shown and described in this ap-Apparatus of this type includes a chamber in plication to illustrate ourinvention also embodies which a vacuous or reduced pressure condition isan invention described and claimed in the apmaintained by an ejector orcompressor, exhaustplication of Paul L. Fetzer, Serial No. 659,402,

ing usually to a condenser. Liquid to be cooled, led March 2, 1933,namely, the manometric conl0 usually water, is circulated or conveyedthrough nection or loop seal hereinafter described. the chamber, thereduced pressure therein eifect- The above and other objects areeffected by ing evaporation 'of a portion of the liquid and ourinvention as will be apparent from the folconsequent cooling of theremaining liquid, which lowing description and claims taken in accordmaythen be used as refrigerating medium or to ance with the accompanyingdrawings, forming 15 provide al supply of cooled liquid. A steam a. partof this application, in which: ejector is not always sufficientlyadaptable to Fig. 1 is a diagrammatic elevation view of one change inload, and is usually operated at full embodiment of the refrigeratingapparatus; load, that is, `with full admission of motivating Fig. 2 is aplan viewof the same embodiment steam or other fluid. showing theejectors and the common condenser; 20

In order to provide economy of operation at and v partial load, it hasbeen proposed to provide a Fig. 3 is a diagrammatic elevational view ofa plurality of evaporating chambers, each of which second lembodimentAof the refrigerating appahas an ejector to effect a reduced pressureconratus.

dition by withdrawing vapor therefrom. The Referring now to the drawingsmore in detail, 25 refrigerant liquid is distributed among the sevweshow steam jet refrigerating apparatus for eral evaporating chambers.For operation at l supplying cooled liquid, such as water, to anyappartial load, one or more ejectors is shut oi, the paratus in which itmay be required. Such apremaining ejector or ejectors continuing toopparatus may be, for example, the air cooler and erate at fullcapacity. Refrigeration is thenefwasher of air conditioning apparatus,shown on 30 fected in only some of the evaporating chambers.- thedrawings at 9.

This presents the problem of supplying full quan- The refrigeratingapparatus (Figs. 1 and 2) tity of refrigerant liquid, which is necessaryin comprises a primary evaporating chamber III and some cases. In airconditioning apparatus comasecondary evaporating chamber II. In thepres- 354 prisingI sprays, for example, a given quantity of entembodiment, these chambers are formed by cooling liquid is required tomaintain the sprays, separate tanks. Steam ejectors I2 and I3, shownregardless of therefrigerating load. in Fig. 2, have their suctioninlets I2' and I3' In accordance with our invention, for operaconnectedto the chambers I0 and II, respec- 40 tion at partial load, we divertthe flow of liquid tively, and effect a. vacuous or reduced pressure 40from theevaporating chambers whose ejectors condition in the respectivechambers by withare shut down, to the evaporating chamber or drawingvapor therefrom. The ejectors I2 and chambers whose ejector or ejectorsremain in op- I3 are motivated by steam from a supply coneration.` lduit Il, the admission thereof being controlled With. this arrangement,the full quantity of by valves I5 and I6, respectively, the operationliquid is refrigerated. Consequently. it is not of which is describedlater. The ejectors exnecessary to cool the liquid to the same degreehaust into a common condenser I1, which is as in the arrangement inwhich only a portion provided with a condensate outlet I0, an air outofthe refrigerant is cooled, and a substantially let I9 connected to anair ejector 2D, a cooling higher yefliciency is obtained. For example,as- 4 water inlet 2| and a cooling water outlet 22. 5o sume thatrefrigerant at 40 degrees F. is required For full load operation, bothejectors are opand that it is returned from the point of use at erated.For partial load operation, only the 421/2 degrees F. If half the liquidis refrigerated, ejector I2 is operated, the ejector I3 being shut it isnecessary to cool to 371/2 degrees F., in order down by closing thevalve IB. The condenser to reduce the total quantity to 40 degrees,wherepressure is then admitted into the chamber II u as if all theliquid is refrigerated, it is only necthrough the ejector Il. l

The water to be cooled is conveyed, in this case from the air cooler, bya conduit 23 to the evaporating chamber or chambers. The water isdivided, one portion being admitted always to spray nozzles 24 in thechamber I8. The remaining portion is admitted by a valve 25 either to asecond group of spray nozzles 26 in the chamber ib, for partial loadoperation, or to spray nozzles 2 in the chamber il, for full loadoperation. Upon being subjected to the vacuum or decreased pressure inthe evaporating chamn ber, the water is partially evaporated, 'whichaction eiects cooling of the remaining water, as is well known in. theart.

The water cooled in each evapora-ting chamber is discharged therefromthrough an outlet in the bottom, the bottom preferably convergingtowardthe outlet. The outlets are connected to a system of conduits,which, is, in accordance With the said invention of Paul L. Fetzer,arranged to provide a Vmanometric connection or loop seal between thechambers to seal the chamber ill against the higher absolute pressure inthe chamber il at partial load operation. This conduit system includesseparate branch discharge conduits 23 and 29 communicating with thechambers Ill and Il, respectively, and witha common discharge conduit3|. The conduit 29 is of smaller diameter than the conduits 28 and 3i,as it never conveys more than a portion of the water, while the conduit28 conveys the full quantity o water at partial load. The conduits 28and 29 extend first downwardly and then communicate at a low levelthrough horizontally extending portions, thereby providing themanometiic connection or loop seal between the chambers I8 and I I. Theconduit 28 is of sufiicient height to provide a head of liquid a whichopposes the increase in pressure in the chamber iI at partial load. Thewater is then conveyed by the conduit 3|, to a pump 32, by which it isforced through a conduit 33 to the air cooler 9 or other reirigeratingload. In the latter, the cooled water is used for cooling and washingair. Obviously, the cooled water may be used as refrigerating medium forany desired purpose. Its temperature having been increased, it isdischarged from the air cooler to the conduit-23 and recirculated.

l Control mechanism for regulating the operation of the refrigeratingapparatus is provided. It includes solenoids 34 and 35 for openinglvalves I5 and I6, respectively, the latter being biased to closedposition by the weight of the core. A solenoid 36 controls the valve 25,which is biased to the position in which it admits Water to the nozzles26 in the chamber IIL-and is operated to admit water to the nozzles 21in thechamber II when the solenoid 36 is energized. The solenoid 34 iscontrolled by contacts 38. 'Ihe contacts 31 and 38 are controlled by athermostat 39 in response to the temperature of the liquid to be cooledat any desired point in its circuit or path. Preferably, and as shown,the thermostat includes an expansible bellows 4I connected by a tube 42to a bulb 43 disposed in the conduit 3|. The thermostat 39 is arrangedto close the contacts 31 in response to a predetermined maximumtemperature; to close both contacts 31 and 38 in response to a slightlyhigher predetermined maximum temperature, and to open both contacts 31and 38 in response to a temperature lower than the ilrst-mentionedpredetermined maximum temperature. For the purpose of an example, thefirst and second preaoeaeie determined maximum temperature will be takenas 40 and 41 F., respectively.

Make-up Water to replace the water' which is vaporized and removed issupplied through a conduit f'i. It is preferably first cooled in one ofthe evaporating chambers, and hence the conduit d may be connected tothe conduit 23. The admission of make-up water is controlled by a valved5, which is controlled by a oat con trol lid in response to the levelof Water in the chamber i9.

The operation of the above-described apparatus is as follows:

When the air cooler or other refrigerating load requires the maximumamount of refrigeration, this is evidenced by a temperature of thecirculating water of 4i F. or higher. The thermostat 39 closes contacts3l and 33, rendering both ejectors operative, and adjusting the valve 25to admit water to the chamber ii. Approximately onenhalf of the water,or any other desired portion, is admitted to the chamber il, and theremaining portion to the chamber ill. The Water is cooled orrefrigerated in the respective chambers as above described,substantially the same degree of vacuum or pressure being maintainedtherein. r The Water is discharged in parallel through the conduits 28and 29 to the conduit 3|, and supplied to the air cooler.

As the requirement for refrigeration decreases, the temperature of thewater decreases. However, the contacts 38 will be kept closed and theapparatus maintained at, full load operation until the temperature dropsbelow al F., indicating that half load operation will supply the neededrefrigeration, at least temporarily. The contacts 38 are then opened,deenergizing the solenoids and 36. The ejector I3 is shut down and thevalve 25 dii/erts the water from the chamber II to the chamber Ill. Dueto the shutting down of the ejector I3, the pressure in the chamber IIwill rise to that in the condenser I1, lowering the level of the waterin the conduit 29, until the difference in head between the column ofwater in the conduit 28 and the bottom of the chamber I8 and the waterin the conduit 29, indicated by the reference character a, balances thedifference between the absolute pressures in the two evaporatingchambers. 'I'he full quantity of water then flows through the chamberIll, the branch discharge conduit 23 and the common conduit 3|, whilethe Water in the branch discharge conduit 29 remains stationary. It isto be noted that the higher pressure in the chamber II tends to heat thewater,

- but as the level of the water is down in the conduit 29, the amount ofsurface of water subject to heating will be negligible.

If the refrigeration requirement is substantially less than full load,and greater than half load, there will be intermittent full load and`half load operation, the temperature of the water decreaslng during thefull load operation and increasing` during the half load operation.

If` the temperature of the water drops below 40 F., indicating that nofurther refrigeration is presently needed, the contacts 31 are alsoopened, shutting down the ejector I2, The water is then circulatedthrough the chamber ||I without any cooling except for the action of theair ejector 20 of the condenser, which effects a small amount ofevaporation of the water and consequent cooling. Upon subsequentincrease in temperature of the water, the contacts 31` will reclose, andcooling at half load is resumed. Thus, a load In Fig. 3, we show asecond embodiment of our invention which is similar to the firstembodiment, except that the evaporating chambers and conduits arearranged for ow of water to be cooled successively through theevaporating chambers when operating at full load, instead of parallelflow. In this case, the evaporating chamber Il constitutes the primarychamber, or the chamber rst in series. It is disposed at a higherelevation than the evaporating chamber I', and its outlet is connectedthrough a looped conduit l to the inlet of the chamber I0. All of thewater delivered by the conduit 2l passes through the valve 25 in thiscase, and is directed thereby to the inlet of the chamber Il', at fullload and to 'the inlet of the chamber.

I0' through a conduit 52 at half load. The same control mechanism usedin the first embodiment may be provided.

At full load operation, effected by the thermostat 39 closing contacts3l and 38 in response to the higher maximum temperature of 41 F., bothejectors are operated and the valve 25 directsall the water to thechamber Il. In the latter, the wateris partially cooled, preferablyone-half of the temperature reduction being effected in this chamber.The Water then flows by gravity through the conduit 5l to the chamberIll', the difference in level between the chambers providing sufficientpressure head to force the water through the nozzles in the chamber l0'.The remainder of the temperature reduction of the water is effected inthe chamber I0', and the water is then discharged therefrom into aconduit 3|'.

At half load operation, the control mechanism operates, as in the firstembodiment, to shut down the ejector I3 and to adjust the valve 25 todirect all the water into the chamber I0'. The apparatus then operatesidentically with half-load operation of the first embodiment, the loopedconduit 5|.providing a loop seal against the higher condenser pressurein the chamber I I'.

With the multi-stage apparatus of Fig. 3, greater efficiency ofoperation is obtained. This is due to the fact that the portion of therefrigeration action effected in the first stage is at a highertemperature, which, as is Well known in the art, is effected moreeconomically.

While we have shown our invention in several forms, it will be obviousto those skilled in the art that it is not so limited, but issusceptible of various other changes and modifications, Withoutdeparting from the spirit thereof, and we desire, therefore, that onlysuch limitations shall be placed thereupon as are imposed by the priorart or as are specifically set forth in the appended claims.

What we claim is:

1. The method of refrigerating which comprises admitting anddistributing a predetermined quantity of liquid to be cooled to aplurality of chambers at full load, admitting substantially saidpredetermined quantity of liquid to fewer of said chambers at partialload, and exhausting vapor from each chamber t9- which liquid is 2. Themethod oi' refrigerating which comprises admitting a predeterminedquantity of liquid to be cooled to and dividing the same among aplurality of evaporating chambers and maintaining a reduced pressurecondition in all of. said chambers at full load, and admittingsubstantially said predetermined quantity to a smaller number of saidchambers and maintaining a reduced pressure condition in said smallernumber of chambers at partial load, whereby substantially the samequantity of cooled liquid is provided at full and partial loads. i

3. The method of refrigerating which comprises supplying a predeterminedquantity of liquid to'be cooled, dividing said quantity among Y aplurality of evaporating chambers for operation at full load, admittingsaid predetermined quantity to a smaller number of said chambers foroperation at partial load, maintaining a reduced pressure condition ineach chamber to -which liquid is admitted to cool said liquid by partialevaporation thereof, and discharging said liquid from said chamber orchambers to provide a predetermined quantity of cooled liquid at eitherfull load or partial load operation.

4. The method of refrigerating which comprises admitting a predeterminedquantity of liquid to one or more of a plurality of evaporating chambersand discharging the cooled liquid therefrom, dividing said predeterminedquantity of liquid among said chambers and exhausting vapor therefrom inresponse to a predetermined maximum temperature of the liquid, andadmitting substantially said predetermined quantity of liquid to alesser number of chambers and exhausting vapor therefrom in response toa lower predetermined maximum temperature of the liquid.

5. In refrigerating apparatus of the vapor jet type, the combination ofa plurality of evaporating chambers, an "ejector connected to Aeachchamber for effecting a vacuous condition therein, and means for passinga given quantity of type comprising a, plurality of evaporatingchambers, means for effecting a reduced pressure condition in saidchambers to provide partial evaporation and cooling of liquid therein.means for distributing a predetermined quantity of liquid to -be cooledto said chambers, means for diverting the liquid from one of saidchambers to another thereof for operation at reduced load, and means forremoving the cooled liquid from said chamber or chambers, whereby thesame quantity of cooled liquid is provided at different loads.

8. In refrigerating apparatus, the combination of a first and a secondevaporating chamber, means for effecting a reduced pressure condition insaid chambers, means for supplying a predetermined quantity of liquid tobe cooled, means for admitting one portion of said quantity of liquid tothe first chamber and means for admitting the remaining portionselectively to either the first or the second chamber.

9. Refrigerating apparatus of the vapor jet type comprising a first anda second evaporating chamber, means for effecting a reducedpressurecondition in said chambers to effect partial evaporation and cooling ofliquid therein, means for supplying liquid to be cooled to saidchambers, said irst and second chambers having inlets adapted to admitsubstantially the same quantity of liquid to be cooled, a valve adapted'to place either one of said inlets in communication with said liquidsupply means, the lrst chamber having a second inlet in communicationwith said liquid supply means, andmeans for discharging cooled liquidfrom said chamber or chambers.

10. In refrigerating apparatus, the combination of a plurality ofevaporating chambers, moans for conveying a predetermined quantity ofliquid through said chambers to be cooled, means for dividing saidpredetermined quantity of liquid among a plurality of said chambers andfor effecting a reduced pressure condition therein in response to apredetermined maximum temperature of said liquid, and means foradmittingsaid predetermined quantity of liquid to a smaller number of saidchambers and effecting a reduced pressure condition therein in responsetoa lower predetermined maximum temperature.

1l. In refrigeratlng apparatus, the combination of a plurality ofevaporating chambers, an ejector for each chamber for producing areduced pressure condition therein to provide partial evaporation andcooling of liquid, means for supplying a predetermined quantity ofliquid to be cooled, means for distributing said predetermined quantityof liquid to a plurality of said chambers and for effecting operation ofthe ejectors connected thereto in response to a predetermined maximumtemperature of the liquid being cooled, and means for admitting saidpredetermined quantity of liquid to a smaller number of chambers and foreffecting operation of the ejector or ejectors connected to said smallernumber of' chambers in response to a lower predetermined maximumtemperature of the liquid being cooled.

12. In refrigerating apparatus, the combinationl of a first and a secondevaporator chamber, an ejector connected to each chamber for effecting avacuous condition to provlderpartlal evaporation and cooling of liquidtherein, a conduit for sup-v plying liquid to be cooled, each of saidchambers having an inlet of substantially the same capacity foradmitting liquid to be cooled, a valve for placing either one of saidinlets in communication with theliquid supply conduit, said rst chamberhaving a second inlet communicating with the liquid supply conduit,means responsive to a 4predetermined maximum temperature of the liquidbeing cooled for effecting operation of both ejectors and actuating the*said valve to admit liquid to the -second chamber, and means responsiveto a lower predetermined maximum temperature of the liquid being cooledfor effecting operation of the ejector connected to the rst chamber andfor actuating said valve to place the rsbmentioned inlet'of the firstchamber in communication with the liquid supply conduit. y

13. In vapor jet apparatus for providing a supply of cooled liquid, thecombination of a plurality of evaporating chambers, an ejector connectedto each chamber for withdrawing vapor therefrom to effect cooling ofliquid therein by partial evaporation, and means for circulating liquidselectively through several evaporating chambers or through a smallernumber of said chambers to provide said supply of cooled liquid. 14. Inrefrigerating apparatus, the combination of a plurality of evaporatingchambers, means associated with each chamberfor withdrawing vaportherefrom to eiect cooling of liquid in the chamber by partialevaporation of the liquid, and means whereby a given quantity ci liquidmay be selectively passed through and cooled in several of saidevaporating chambers or passed through and cooled in a smaller number ofsaid chambers. l5. In refrigerating apparatus, the combination of aplurality of evaporating chambers, a fluid translating element connectedto each chamber for reducing the pressure therein to provide partialevaporation and cooling of liquid therein,

means responsive to the cooling demand for rendering said elementsindividually operative or inoperative, and means for conveying asubstantially constant quantity oi liquid through only the chamber orchambers whose uld'translating elements are rendered operative.

i6. in refrigerating apparatus, the combination oi a plurality ofevaporator chambers, a fluid translating element connected to eachchainber to providepartial evaporation and cooling of liquid therein,means for supplying liquid to be cooled to said chambers, and valvemeans controlling flow of liquid to be cooled and operative to shut ofiflow oi' liquid to one chamber and simultaneously to increasethe flow ofliquid to another chamber.

17. In refrigerating apparatus, the combination of a plurality or"evaporator chambers, an ejector connected to each chamber to providepartial evaporation and cooling of liquid therein, means for supplyingliquid to be cooled to said chambers, and means operative in response toincrease in temperature of the vcooled liquid above a predeterminedvalue to render a plurality of said ejectors effective and operative inresponse to decrease in said temperature below said value to render oneof said last-mentioned ejectors ineffective, to terminate admission ofliquid to be cooled to the associated chamber, and to increase theadmission of liquid to be cooled to another chamber whose ejectorremains effective.

' ERNEST F. STALCUP.

MILLARD A. NELSON.

D l SC I Al M E R 2,093,2l6.- -Emest F. Stalcup, Rutledge, and MillardA. Nelson, Prospect Park, Pa.

COOLING APPARATUS.

Patent dated September 14, 1937. Disclaimer filed March 16,l 1938, bythe assignee, Westinghouse Electric da Manufacturing Company.

Hereb i icz'al Gazette April 12, 1.938.]

enters this disclaimer to claim 13 of said 'speciication n the remainingportion selectively to either the first or the second chamber.

9. Refrigerating apparatus of the vapor jet type comprising a first anda second evaporating chamber, means for effecting a reducedpressurecondition in said chambers to effect partial evaporation and cooling ofliquid therein, means for supplying liquid to be cooled to saidchambers, said irst and second chambers having inlets adapted to admitsubstantially the same quantity of liquid to be cooled, a valve adapted'to place either one of said inlets in communication with said liquidsupply means, the lrst chamber having a second inlet in communicationwith said liquid supply means, andmeans for discharging cooled liquidfrom said chamber or chambers.

10. In refrigerating apparatus, the combination of a plurality ofevaporating chambers, moans for conveying a predetermined quantity ofliquid through said chambers to be cooled, means for dividing saidpredetermined quantity of liquid among a plurality of said chambers andfor effecting a reduced pressure condition therein in response to apredetermined maximum temperature of said liquid, and means foradmittingsaid predetermined quantity of liquid to a smaller number of saidchambers and effecting a reduced pressure condition therein in responsetoa lower predetermined maximum temperature.

1l. In refrigeratlng apparatus, the combination of a plurality ofevaporating chambers, an ejector for each chamber for producing areduced pressure condition therein to provide partial evaporation andcooling of liquid, means for supplying a predetermined quantity ofliquid to be cooled, means for distributing said predetermined quantityof liquid to a plurality of said chambers and for effecting operation ofthe ejectors connected thereto in response to a predetermined maximumtemperature of the liquid being cooled, and means for admitting saidpredetermined quantity of liquid to a smaller number of chambers and foreffecting operation of the ejector or ejectors connected to said smallernumber of' chambers in response to a lower predetermined maximumtemperature of the liquid being cooled.

12. In refrigerating apparatus, the combinationl of a first and a secondevaporator chamber, an ejector connected to each chamber for effecting avacuous condition to provlderpartlal evaporation and cooling of liquidtherein, a conduit for sup-v plying liquid to be cooled, each of saidchambers having an inlet of substantially the same capacity foradmitting liquid to be cooled, a valve for placing either one of saidinlets in communication with theliquid supply conduit, said rst chamberhaving a second inlet communicating with the liquid supply conduit,means responsive to a 4predetermined maximum temperature of the liquidbeing cooled for effecting operation of both ejectors and actuating the*said valve to admit liquid to the -second chamber, and means responsiveto a lower predetermined maximum temperature of the liquid being cooledfor effecting operation of the ejector connected to the rst chamber andfor actuating said valve to place the rsbmentioned inlet'of the firstchamber in communication with the liquid supply conduit. y

13. In vapor jet apparatus for providing a supply of cooled liquid, thecombination of a plurality of evaporating chambers, an ejector connectedto each chamber for withdrawing vapor therefrom to effect cooling ofliquid therein by partial evaporation, and means for circulating liquidselectively through several evaporating chambers or through a smallernumber of said chambers to provide said supply of cooled liquid. 14. Inrefrigerating apparatus, the combination of a plurality of evaporatingchambers, means associated with each chamberfor withdrawing vaportherefrom to eiect cooling of liquid in the chamber by partialevaporation of the liquid, and means whereby a given quantity ci liquidmay be selectively passed through and cooled in several of saidevaporating chambers or passed through and cooled in a smaller number ofsaid chambers. l5. In refrigerating apparatus, the combination of aplurality of evaporating chambers, a fluid translating element connectedto each chamber for reducing the pressure therein to provide partialevaporation and cooling of liquid therein,

means responsive to the cooling demand for rendering said elementsindividually operative or inoperative, and means for conveying asubstantially constant quantity oi liquid through only the chamber orchambers whose uld'translating elements are rendered operative.

i6. in refrigerating apparatus, the combination oi a plurality ofevaporator chambers, a fluid translating element connected to eachchainber to providepartial evaporation and cooling of liquid therein,means for supplying liquid to be cooled to said chambers, and valvemeans controlling flow of liquid to be cooled and operative to shut ofiflow oi' liquid to one chamber and simultaneously to increasethe flow ofliquid to another chamber.

17. In refrigerating apparatus, the combination of a plurality or"evaporator chambers, an ejector connected to each chamber to providepartial evaporation and cooling of liquid therein, means for supplyingliquid to be cooled to said chambers, and means operative in response toincrease in temperature of the vcooled liquid above a predeterminedvalue to render a plurality of said ejectors effective and operative inresponse to decrease in said temperature below said value to render oneof said last-mentioned ejectors ineffective, to terminate admission ofliquid to be cooled to the associated chamber, and to increase theadmission of liquid to be cooled to another chamber whose ejectorremains effective.

' ERNEST F. STALCUP.

MILLARD A. NELSON.

D l SC I Al M E R 2,093,2l6.- -Emest F. Stalcup, Rutledge, and MillardA. Nelson, Prospect Park, Pa.

COOLING APPARATUS.

Patent dated September 14, 1937. Disclaimer filed March 16,l 1938, bythe assignee, Westinghouse Electric da Manufacturing Company.

Hereb i icz'al Gazette April 12, 1.938.]

enters this disclaimer to claim 13 of said 'speciication

